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 Post subject: Half life chemistry question?
PostPosted: Sun Apr 20, 2014 2:16 pm 
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What is the half life of a first order reaction if it takes 7.1X10^-4 seconds for the concentration to decrease from 0.460 M to 0.100 M?

If you can show how you got the answer that would be awesome!


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 Post subject: Half life chemistry question?
PostPosted: Sun Dec 24, 2017 3:24 am 
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ln 0.100/ 0.460 = - k x 7.1 x 10^-4

1.53 = k x 7.1 x 10^-4
k = 2149

t1/2 = ln 2 / k = 0.000322 s



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